Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Gross Notional Values of Derivatives (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Gross Notional Values of Derivatives (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value $ 25,927 $ 4,877
Fair Value Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 7,540 4,865
Cash Flow Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 18,387 12
Loans    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 18,375  
Loans | Fair Value Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 0  
Loans | Cash Flow Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 18,375  
Securities Investment [Member]    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 12 12
Securities Investment [Member] | Fair Value Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 0 0
Securities Investment [Member] | Cash Flow Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 12 12
Other long term debt [Member]    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 7,540 4,865
Other long term debt [Member] | Fair Value Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 7,540 4,865
Other long term debt [Member] | Cash Flow Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value $ 0 0
Foreign Exchange Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Customer Contracts [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Commodity Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Other Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Mortgage banking income  
Interest Rate Floor [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Other noninterest income  
Equity Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Other noninterest expense  
Not Designated as Hedging Instrument [Member] | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 112 59
Equity Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Expense [Member] | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (4) 4
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Capital markets fees [Domain] | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (2) 6
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Capital markets fees [Domain] | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 28 27
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Capital markets fees [Domain] | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 49 41
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Mortgage Banking Income [Member] | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 37 (19)
Interest Rate Floor [Member]    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 9,750  
Interest Rate Floor [Member] | Not Designated as Hedging Instrument [Member] | Other noninterest income [Domain] | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 4 $ 0